1. From what I read, PDF support is still lacking. And Amazon hasn't released an update in more than a year, so they are not really supporting this product anymore, it seems.

2. I am afraid to buy it now only to see a new, better DX in a few months. Amazon usually releases new Kindles during the summer, right?

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I totally agree. Would love to get finally a DX since the first day I got the new Kindle.
I have to read a lot of scientific literature and reports and it would be just perfect for it.
BUT, the pdf support is still poor compared to the normal Kindle, no update released for a long time and the fear that a new one (hopefully without these drawbacks) would be released soon are holding me back.

I really hope that they manage to get the pdf support enhanced. Some annotation, export and so on function would make this device just perfect.